1 /*
2 * sdhci-pltfm.c Support for SDHCI platform devices
3 * Copyright (c) 2009 Intel Corporation
4 *
5 * Copyright (c) 2007, 2011 Freescale Semiconductor, Inc.
6 * Copyright (c) 2009 MontaVista Software, Inc.
7 *
8 * Authors: Xiaobo Xie <X.Xie@freescale.com>
9 * Anton Vorontsov <avorontsov@ru.mvista.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25 /* Supports:
26 * SDHCI platform devices
27 *
28 * Inspired by sdhci-pci.c, by Pierre Ossman
29 */
30
31 #include <linux/err.h>
32 #include <linux/module.h>
33 #include <linux/of.h>
34 #ifdef CONFIG_PPC
35 #include <asm/machdep.h>
36 #endif
37 #include "sdhci-pltfm.h"
38
39 static struct sdhci_ops sdhci_pltfm_ops = {
40 };
41
42 #ifdef CONFIG_OF
sdhci_of_wp_inverted(struct device_node * np)43 static bool sdhci_of_wp_inverted(struct device_node *np)
44 {
45 if (of_get_property(np, "sdhci,wp-inverted", NULL))
46 return true;
47
48 /* Old device trees don't have the wp-inverted property. */
49 #ifdef CONFIG_PPC
50 return machine_is(mpc837x_rdb) || machine_is(mpc837x_mds);
51 #else
52 return false;
53 #endif /* CONFIG_PPC */
54 }
55
sdhci_get_of_property(struct platform_device * pdev)56 void sdhci_get_of_property(struct platform_device *pdev)
57 {
58 struct device_node *np = pdev->dev.of_node;
59 struct sdhci_host *host = platform_get_drvdata(pdev);
60 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
61 const __be32 *clk;
62 int size;
63
64 if (of_device_is_available(np)) {
65 if (of_get_property(np, "sdhci,auto-cmd12", NULL))
66 host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
67
68 if (of_get_property(np, "sdhci,1-bit-only", NULL))
69 host->quirks |= SDHCI_QUIRK_FORCE_1_BIT_DATA;
70
71 if (sdhci_of_wp_inverted(np))
72 host->quirks |= SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
73
74 if (of_device_is_compatible(np, "fsl,p2020-rev1-esdhc"))
75 host->quirks |= SDHCI_QUIRK_BROKEN_DMA;
76
77 if (of_device_is_compatible(np, "fsl,p2020-esdhc") ||
78 of_device_is_compatible(np, "fsl,p1010-esdhc") ||
79 of_device_is_compatible(np, "fsl,mpc8536-esdhc"))
80 host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
81
82 clk = of_get_property(np, "clock-frequency", &size);
83 if (clk && size == sizeof(*clk) && *clk)
84 pltfm_host->clock = be32_to_cpup(clk);
85 }
86 }
87 #else
sdhci_get_of_property(struct platform_device * pdev)88 void sdhci_get_of_property(struct platform_device *pdev) {}
89 #endif /* CONFIG_OF */
90 EXPORT_SYMBOL_GPL(sdhci_get_of_property);
91
sdhci_pltfm_init(struct platform_device * pdev,struct sdhci_pltfm_data * pdata)92 struct sdhci_host *sdhci_pltfm_init(struct platform_device *pdev,
93 struct sdhci_pltfm_data *pdata)
94 {
95 struct sdhci_host *host;
96 struct sdhci_pltfm_host *pltfm_host;
97 struct device_node *np = pdev->dev.of_node;
98 struct resource *iomem;
99 int ret;
100
101 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
102 if (!iomem) {
103 ret = -ENOMEM;
104 goto err;
105 }
106
107 if (resource_size(iomem) < 0x100)
108 dev_err(&pdev->dev, "Invalid iomem size!\n");
109
110 /* Some PCI-based MFD need the parent here */
111 if (pdev->dev.parent != &platform_bus && !np)
112 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
113 else
114 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
115
116 if (IS_ERR(host)) {
117 ret = PTR_ERR(host);
118 goto err;
119 }
120
121 pltfm_host = sdhci_priv(host);
122
123 host->hw_name = dev_name(&pdev->dev);
124 if (pdata && pdata->ops)
125 host->ops = pdata->ops;
126 else
127 host->ops = &sdhci_pltfm_ops;
128 if (pdata)
129 host->quirks = pdata->quirks;
130 host->irq = platform_get_irq(pdev, 0);
131
132 if (!request_mem_region(iomem->start, resource_size(iomem),
133 mmc_hostname(host->mmc))) {
134 dev_err(&pdev->dev, "cannot request region\n");
135 ret = -EBUSY;
136 goto err_request;
137 }
138
139 host->ioaddr = ioremap(iomem->start, resource_size(iomem));
140 if (!host->ioaddr) {
141 dev_err(&pdev->dev, "failed to remap registers\n");
142 ret = -ENOMEM;
143 goto err_remap;
144 }
145
146 platform_set_drvdata(pdev, host);
147
148 return host;
149
150 err_remap:
151 release_mem_region(iomem->start, resource_size(iomem));
152 err_request:
153 sdhci_free_host(host);
154 err:
155 dev_err(&pdev->dev, "%s failed %d\n", __func__, ret);
156 return ERR_PTR(ret);
157 }
158 EXPORT_SYMBOL_GPL(sdhci_pltfm_init);
159
sdhci_pltfm_free(struct platform_device * pdev)160 void sdhci_pltfm_free(struct platform_device *pdev)
161 {
162 struct sdhci_host *host = platform_get_drvdata(pdev);
163 struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
164
165 iounmap(host->ioaddr);
166 release_mem_region(iomem->start, resource_size(iomem));
167 sdhci_free_host(host);
168 platform_set_drvdata(pdev, NULL);
169 }
170 EXPORT_SYMBOL_GPL(sdhci_pltfm_free);
171
sdhci_pltfm_register(struct platform_device * pdev,struct sdhci_pltfm_data * pdata)172 int sdhci_pltfm_register(struct platform_device *pdev,
173 struct sdhci_pltfm_data *pdata)
174 {
175 struct sdhci_host *host;
176 int ret = 0;
177
178 host = sdhci_pltfm_init(pdev, pdata);
179 if (IS_ERR(host))
180 return PTR_ERR(host);
181
182 sdhci_get_of_property(pdev);
183
184 ret = sdhci_add_host(host);
185 if (ret)
186 sdhci_pltfm_free(pdev);
187
188 return ret;
189 }
190 EXPORT_SYMBOL_GPL(sdhci_pltfm_register);
191
sdhci_pltfm_unregister(struct platform_device * pdev)192 int sdhci_pltfm_unregister(struct platform_device *pdev)
193 {
194 struct sdhci_host *host = platform_get_drvdata(pdev);
195 int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
196
197 sdhci_remove_host(host, dead);
198 sdhci_pltfm_free(pdev);
199
200 return 0;
201 }
202 EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
203
204 #ifdef CONFIG_PM
sdhci_pltfm_suspend(struct device * dev)205 static int sdhci_pltfm_suspend(struct device *dev)
206 {
207 struct sdhci_host *host = dev_get_drvdata(dev);
208
209 return sdhci_suspend_host(host);
210 }
211
sdhci_pltfm_resume(struct device * dev)212 static int sdhci_pltfm_resume(struct device *dev)
213 {
214 struct sdhci_host *host = dev_get_drvdata(dev);
215
216 return sdhci_resume_host(host);
217 }
218
219 const struct dev_pm_ops sdhci_pltfm_pmops = {
220 .suspend = sdhci_pltfm_suspend,
221 .resume = sdhci_pltfm_resume,
222 };
223 EXPORT_SYMBOL_GPL(sdhci_pltfm_pmops);
224 #endif /* CONFIG_PM */
225
sdhci_pltfm_drv_init(void)226 static int __init sdhci_pltfm_drv_init(void)
227 {
228 pr_info("sdhci-pltfm: SDHCI platform and OF driver helper\n");
229
230 return 0;
231 }
232 module_init(sdhci_pltfm_drv_init);
233
sdhci_pltfm_drv_exit(void)234 static void __exit sdhci_pltfm_drv_exit(void)
235 {
236 }
237 module_exit(sdhci_pltfm_drv_exit);
238
239 MODULE_DESCRIPTION("SDHCI platform and OF driver helper");
240 MODULE_AUTHOR("Intel Corporation");
241 MODULE_LICENSE("GPL v2");
242